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  1. Article ; Online: Adherence of the rotating vortex lattice in the noncentrosymmetric superconductor Ru

    Cameron, A S / Tymoshenko, Y V / Portnichenko, P Y / Sukhanov, A S / Ciomaga Hatnean, M / McK Paul, D / Balakrishnan, G / Cubitt, R / Inosov, D S

    Journal of physics. Condensed matter : an Institute of Physics journal

    2023  Volume 35, Issue 42

    Abstract: The noncentrosymmetric superconductor ... ...

    Abstract The noncentrosymmetric superconductor Ru
    Language English
    Publishing date 2023-07-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/ace576
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Magnetic phase diagram of the helimagnetic spinel compound ZnCr2Se4 revisited by small-angle neutron scattering.

    Cameron, A S / Tymoshenko, Y V / Portnichenko, P Y / Gavilano, J / Tsurkan, V / Felea, V / Loidl, A / Zherlitsyn, S / Wosnitza, J / Inosov, D S

    Journal of physics. Condensed matter : an Institute of Physics journal

    2016  Volume 28, Issue 14, Page(s) 146001

    Abstract: We performed small-angle neutron scattering (SANS) measurements on the helimagnetic spinel compound ZnCr2Se4. The ground state of this material is a multi-domain spin-spiral phase, which undergoes domain selection in a magnetic field and reportedly ... ...

    Abstract We performed small-angle neutron scattering (SANS) measurements on the helimagnetic spinel compound ZnCr2Se4. The ground state of this material is a multi-domain spin-spiral phase, which undergoes domain selection in a magnetic field and reportedly exhibits a transition to a proposed spin-nematic phase at higher fields. We observed a continuous change in the magnetic structure as a function of field and temperature, as well as a weak discontinuous jump in the spiral pitch across the domain-selection transition upon increasing field. From our SANS results we have established the absence of any long-range magnetic order in the high-field (spin-nematic) phase. We also found that all the observed phase transitions are surprisingly isotropic with respect to the field direction.
    Language English
    Publishing date 2016-04-13
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/0953-8984/28/14/146001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Nesting-driven multipolar order in CeB6 from photoemission tomography.

    Koitzsch, A / Heming, N / Knupfer, M / Büchner, B / Portnichenko, P Y / Dukhnenko, A V / Shitsevalova, N Y / Filipov, V B / Lev, L L / Strocov, V N / Ollivier, J / Inosov, D S

    Nature communications

    2016  Volume 7, Page(s) 10876

    Abstract: Some heavy fermion materials show so-called hidden-order phases which are invisible to many characterization techniques and whose microscopic origin remained controversial for decades. Among such hidden-order compounds, CeB6 is of model character due to ... ...

    Abstract Some heavy fermion materials show so-called hidden-order phases which are invisible to many characterization techniques and whose microscopic origin remained controversial for decades. Among such hidden-order compounds, CeB6 is of model character due to its simple electronic configuration and crystal structure. Apart from more conventional antiferromagnetism, it shows an elusive phase at low temperatures, which is commonly associated with multipolar order. Here we show that this phase roots in a Fermi surface instability. This conclusion is based on a full 3D tomographic sampling of the electronic structure by angle-resolved photoemission and comparison with inelastic neutron scattering data. The hidden order is mediated by itinerant electrons. Our measurements will serve as a paradigm for the investigation of hidden-order phases in f-electron systems, but also generally for situations where the itinerant electrons drive orbital or spin order.
    MeSH term(s) Cerium/chemistry ; Crystallization ; Electrons ; Hydroxides/chemistry ; Magnetics ; Models, Chemical ; Neutrons ; Temperature ; Tomography, X-Ray Computed
    Chemical Substances Hydroxides ; Cerium (30K4522N6T) ; cerium hydroxide (85885-77-4)
    Language English
    Publishing date 2016-03-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/ncomms10876
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Destruction of long-range magnetic order in an external magnetic field and the associated spin dynamics in Cu2GaBO5 and Cu2AlBO5 ludwigites

    Kulbakov, A. A. / Sarkar, R. / Janson, O. / Dengre, S. / Weinhold, T. / Moshkina, E. M. / Portnichenko, P. Y. / Luetkens, H. / Yokaichiya, F. / Sukhanov, A. S. / Eremina, R. M. / Schlender, Ph. / Schneidewind, A. / Klauss, H. -H. / Inosov, D. S.

    2020  

    Abstract: The quantum spin systems Cu$_2$M'BO$_5$ (M' = Al, Ga) with the ludwigite crystal structure consist of a structurally ordered Cu$^{2+}$ sublattice in the form of three-leg ladders, interpenetrated by a structurally disordered sublattice with a ... ...

    Abstract The quantum spin systems Cu$_2$M'BO$_5$ (M' = Al, Ga) with the ludwigite crystal structure consist of a structurally ordered Cu$^{2+}$ sublattice in the form of three-leg ladders, interpenetrated by a structurally disordered sublattice with a statistically random site occupation by magnetic Cu$^{2+}$ and nonmagnetic Ga$^{3+}$ or Al$^{3+}$ ions. A microscopic analysis based on density-functional-theory calculations for Cu$_2$GaBO$_5$ reveals a frustrated quasi-two-dimensional spin model featuring five inequivalent antiferromagnetic exchanges. A broad low-temperature $^{11}$B nuclear magnetic resonance points to a considerable spin disorder in the system. In zero magnetic field, antiferromagnetic order sets in below $T_\text{N}$ $\approx$ 4.1 K and ~2.4 K for the Ga and Al compounds, respectively. From neutron diffraction, we find that the magnetic propagation vector in Cu$_2$GaBO$_5$ is commensurate and lies on the Brillouin-zone boundary in the (H0L) plane, $\mathbf{q}_\text{m}$ = (0.45 0 -0.7), corresponding to a complex noncollinear long-range ordered structure with a large magnetic unit cell. Muon spin relaxation is monotonic, consisting of a fast static component typical for complex noncollinear spin systems and a slow dynamic component originating from the relaxation on low-energy spin fluctuations. Gapless spin dynamics in the form of a diffuse quasielastic peak is also evidenced by inelastic neutron scattering. Most remarkably, application of a magnetic field above 1 T destroys the static long-range order, which is manifested in the gradual broadening of the magnetic Bragg peaks. We argue that such a crossover from a magnetically long-range ordered state to a spin-glass regime may result from orphan spins on the structurally disordered magnetic sublattice, which are polarized in magnetic field and thus act as a tuning knob for field-controlled magnetic disorder.

    Comment: 14 pages, 13 figures
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2020-11-11
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Magnon spectrum of the helimagnetic insulator Cu2OSeO3.

    Portnichenko, P Y / Romhányi, J / Onykiienko, Y A / Henschel, A / Schmidt, M / Cameron, A S / Surmach, M A / Lim, J A / Park, J T / Schneidewind, A / Abernathy, D L / Rosner, H / van den Brink, Jeroen / Inosov, D S

    Nature communications

    2016  Volume 7, Page(s) 10725

    Abstract: Complex low-temperature-ordered states in chiral magnets are typically governed by a competition between multiple magnetic interactions. The chiral-lattice multiferroic Cu2OSeO3 became the first insulating helimagnetic material in which a long-range ... ...

    Abstract Complex low-temperature-ordered states in chiral magnets are typically governed by a competition between multiple magnetic interactions. The chiral-lattice multiferroic Cu2OSeO3 became the first insulating helimagnetic material in which a long-range order of topologically stable spin vortices known as skyrmions was established. Here we employ state-of-the-art inelastic neutron scattering to comprehend the full three-dimensional spin-excitation spectrum of Cu2OSeO3 over a broad range of energies. Distinct types of high- and low-energy dispersive magnon modes separated by an extensive energy gap are observed in excellent agreement with the previously suggested microscopic theory based on a model of entangled Cu4 tetrahedra. The comparison of our neutron spectroscopy data with model spin-dynamical calculations based on these theoretical proposals enables an accurate quantitative verification of the fundamental magnetic interactions in Cu2OSeO3 that are essential for understanding its abundant low-temperature magnetically ordered phases.
    Language English
    Publishing date 2016-02-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms10725
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Inter-library loan at ZB MED

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  6. Article ; Online: Nesting-driven multipolar order in CeB6 from photoemission tomography

    A. Koitzsch / N. Heming / M. Knupfer / B. Büchner / P. Y. Portnichenko / A. V Dukhnenko / N. Y. Shitsevalova / V. B. Filipov / L. L. Lev / V. N. Strocov / J. Ollivier / D. S. Inosov

    Nature Communications, Vol 7, Iss 1, Pp 1-

    2016  Volume 7

    Abstract: In compounds containing 4f and 5f elements, hidden-order phases exist which are undetectable by many methods, the origins of which are debated. Here, the authors use photoemission and neutron scattering methods to show how such a multipolar-ordered phase ...

    Abstract In compounds containing 4f and 5f elements, hidden-order phases exist which are undetectable by many methods, the origins of which are debated. Here, the authors use photoemission and neutron scattering methods to show how such a multipolar-ordered phase emerges due to Fermi surface instability in CeB6.
    Keywords Science ; Q
    Language English
    Publishing date 2016-03-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
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  7. Article ; Online: Magnon spectrum of the helimagnetic insulator Cu2OSeO3

    P. Y. Portnichenko / J. Romhányi / Y. A. Onykiienko / A. Henschel / M. Schmidt / A. S. Cameron / M. A. Surmach / J. A. Lim / J. T. Park / A. Schneidewind / D. L. Abernathy / H. Rosner / Jeroen van den Brink / D. S. Inosov

    Nature Communications, Vol 7, Iss 1, Pp 1-

    2016  Volume 8

    Abstract: Cu2OSeO3 possesses a helical spin structure which supports a rich phase diagram of magnetic states, including a lattice of particle-like skyrmions. Here, the authors use inelastic neutron scattering to elucidate the three-dimensional magnon spectrum and ... ...

    Abstract Cu2OSeO3 possesses a helical spin structure which supports a rich phase diagram of magnetic states, including a lattice of particle-like skyrmions. Here, the authors use inelastic neutron scattering to elucidate the three-dimensional magnon spectrum and underlying spin Hamiltonian of Cu2OSeO3.
    Keywords Science ; Q
    Language English
    Publishing date 2016-02-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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